14-Bit, 20/40/65/80 MSPS,
1.8 V Analog-to-Digital Converter
Data Sheet
AD9649
FEATURES
FUNCTIONAL BLOCK DIAGRAM
AVDD
GND
SDIO SCLK CSB
DRVDD
1.8 V analog supply operation
1.8 V to 3.3 V output supply
SNR
74.3 dBFS at 9.7 MHz input
71.5 dBFS at 200 MHz input
SFDR
RBIAS
VCM
SPI
OR
PROGRAMMING DATA
D13 (MSB)
VIN+
VIN–
ADC
CORE
D0 (LSB)
DCO
93 dBc at 9.7 MHz input
80 dBc at 200 MHz input
VREF
Low power
45 mW at 20 MSPS
SENSE
AD9649
REF
SELECT
87 mW at 80 MSPS
Differential input with 700 MHz bandwidth
On-chip voltage reference and sample-and-hold circuit
2 V p-p differential analog input
DNL = 0.35 LSB
MODE
DIVIDE BY
1, 2, 4
CONTROLS
CLK+ CLK–
PDWN DFS MODE
Serial port control options
Offset binary, gray code, or twos complement data format
Integer 1, 2, or 4 input clock divider
Built-in selectable digital test pattern generation
Energy-saving power-down modes
Data clock out (DCO) with programmable clock and data
alignment
Figure 1.
PRODUCT HIGHLIGHTS
1. The AD9649 operates from a single 1.8 V analog power
supply and features a separate digital output driver supply
to accommodate 1.8 V to 3.3 V logic families.
2. The sample-and-hold circuit maintains excellent performance
for input frequencies up to 200 MHz and is designed for low
cost, low power, and ease of use.
APPLICATIONS
Communications
3. A standard serial port interface (SPI) supports various
product features and functions, such as data output format-
ting, internal clock divider, power-down, DCO, data output
(D13 to D0) timing and offset adjustments, and voltage
reference modes.
4. The AD9649 is packaged in a 32-lead RoHS-compliant LFCSP
that is pin compatible with the AD9629 12-bit ADC and
the AD9609 10-bit ADC, enabling a simple migration path
between 10-bit and 14-bit converters sampling from 20 MSPS
to 80 MSPS.
Diversity radio systems
Multimode digital receivers
GSM, EDGE, W-CDMA, LT E, CDMA2000, WiMAX, TD-SCDMA
Smart antenna systems
Battery-powered instruments
Handheld scope meters
Portable medical imaging
Ultrasound
Radar/LIDAR
Rev. B
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